EFFECTS OF MICRO-PLASMA OXIDATION COATINGS ON THE CORROSION RESISTANCE OF TC4 ALLOY

J Chin Soc Corr Pro

2005, Vol. 25

Issue (4): 222-225 DOI:

Research Report

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EFFECTS OF MICRO-PLASMA OXIDATION COATINGS ON THE CORROSION RESISTANCE OF TC4 ALLOY

Zhongping Yao;Zhaohua Jiang;Shigang Xin;Xuetong Sun;Xuelin Zhang;Zhendong Wu

哈尔滨工业大学应用化学系

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Abstract Compound ceramic coatings on TC4 alloy were prepared by pulsed bi-polar micro-plasma oxidation in NaAlO2 system.The results show that the ceramic coating was composed of Al2TiO5,α-Al2O3 and rutile TiO2,of which Al2TiO5 was the main crystalline.The content of rutile TiO2 increased with depth from the surface,whereas the content of α-Al2O3 decreased from the surface to the inner.The coatings had a duplicate structure with a loose outer layer and a compact inner layer.The corrosion resistance of TC4 alloy was improved in H2SO4 and HCl due to micro-plasma oxidation.The pitting corrosion resistance of the coated samples was much better than TC4 substrate.Meanwhile,the galvanic corrosion resistance of TC4 coupled with LY12 Al-alloy was also improved because of existin g of the ceramic coating on TC4.

Key words: Micro-plasma oxidation Ceramic coatings Corrosion resistance Titanium alloy

Received: 08 May 2004

ZTFLH:

TG113.23

Corresponding Authors: Zhongping Yao E-mail: yaozhongping@hit.edu.cn

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	Zhendong Wu

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Zhongping Yao; Zhaohua Jiang; Shigang Xin; Xuetong Sun; Xuelin Zhang; Zhendong Wu. EFFECTS OF MICRO-PLASMA OXIDATION COATINGS ON THE CORROSION RESISTANCE OF TC4 ALLOY. J Chin Soc Corr Pro, 2005, 25(4): 222-225 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2005/V25/I4/222

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